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2018-07-30net/sched: user-space can't set unknown tcfa_action valuesPaolo Abeni1-0/+14
Currently, when initializing an action, the user-space can specify and use arbitrary values for the tcfa_action field. If the value is unknown by the kernel, is implicitly threaded as TC_ACT_UNSPEC. This change explicitly checks for unknown values at action creation time, and explicitly convert them to TC_ACT_UNSPEC. No functional changes are introduced, but this will allow introducing tcfa_action values not exposed to user-space in a later patch. Note: we can't use the above to hide TC_ACT_REDIRECT from user-space, as the latter is already part of uAPI. v3 -> v4: - use an helper to check for action validity (JiriP) - emit an extack for invalid actions (JiriP) v4 -> v5: - keep messages on a single line, drop net_warn (Marcelo) Signed-off-by: Paolo Abeni <pabeni@redhat.com> Acked-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-07-27net: sched: don't dump chains only held by actionsJiri Pirko1-2/+2
In case a chain is empty and not explicitly created by a user, such chain should not exist. The only exception is if there is an action "goto chain" pointing to it. In that case, don't show the chain in the dump. Track the chain references held by actions and use them to find out if a chain should or should not be shown in chain dump. Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-07-11net: sched: fix unprotected access to rcu cookie pointerVlad Buslov1-2/+7
Fix action attribute size calculation function to take rcu read lock and access act_cookie pointer with rcu dereference. Fixes: eec94fdb0480 ("net: sched: use rcu for action cookie update") Reported-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-07-08net: sched: Fix warnings from xchg() on RCU'd cookie pointer.David S. Miller1-1/+1
The kbuild test robot reports: >> net/sched/act_api.c:71:15: sparse: incorrect type in initializer (different address spaces) @@ expected struct tc_cookie [noderef] <asn:4>*__ret @@ got [noderef] <asn:4>*__ret @@ net/sched/act_api.c:71:15: expected struct tc_cookie [noderef] <asn:4>*__ret net/sched/act_api.c:71:15: got struct tc_cookie *new_cookie >> net/sched/act_api.c:71:13: sparse: incorrect type in assignment (different address spaces) @@ expected struct tc_cookie *old @@ got struct tc_cookie [noderef] <struct tc_cookie *old @@ net/sched/act_api.c:71:13: expected struct tc_cookie *old net/sched/act_api.c:71:13: got struct tc_cookie [noderef] <asn:4>*[assigned] __ret >> net/sched/act_api.c:132:48: sparse: dereference of noderef expression Handle this in the usual way by force casting away the __rcu annotation when we are using xchg() on it. Fixes: eec94fdb0480 ("net: sched: use rcu for action cookie update") Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-07-08net: sched: change action API to use array of pointers to actionsVlad Buslov1-39/+50
Act API used linked list to pass set of actions to functions. It is intrusive data structure that stores list nodes inside action structure itself, which means it is not safe to modify such list concurrently. However, action API doesn't use any linked list specific operations on this set of actions, so it can be safely refactored into plain pointer array. Refactor action API to use array of pointers to tc_actions instead of linked list. Change argument 'actions' type of exported action init, destroy and dump functions. Acked-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-07-08net: sched: atomically check-allocate actionVlad Buslov1-20/+72
Implement function that atomically checks if action exists and either takes reference to it, or allocates idr slot for action index to prevent concurrent allocations of actions with same index. Use EBUSY error pointer to indicate that idr slot is reserved. Implement cleanup helper function that removes temporary error pointer from idr. (in case of error between idr allocation and insertion of newly created action to specified index) Refactor all action init functions to insert new action to idr using this API. Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-07-08net: sched: use reference counting action initVlad Buslov1-18/+17
Change action API to assume that action init function always takes reference to action, even when overwriting existing action. This is necessary because action API continues to use action pointer after init function is done. At this point action becomes accessible for concurrent modifications, so user must always hold reference to it. Implement helper put list function to atomically release list of actions after action API init code is done using them. Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-07-08net: sched: don't release reference on action overwriteVlad Buslov1-2/+0
Return from action init function with reference to action taken, even when overwriting existing action. Action init API initializes its fourth argument (pointer to pointer to tc action) to either existing action with same index or newly created action. In case of existing index(and bind argument is zero), init function returns without incrementing action reference counter. Caller of action init then proceeds working with action, without actually holding reference to it. This means that action could be deleted concurrently. Change action init behavior to always take reference to action before returning successfully, in order to protect from concurrent deletion. Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-07-08net: sched: implement reference counted action releaseVlad Buslov1-22/+62
Implement helper delete function that uses new action ops 'delete', instead of destroying action directly. This is required so act API could delete actions by index, without holding any references to action that is being deleted. Implement function __tcf_action_put() that releases reference to action and frees it, if necessary. Refactor action deletion code to use new put function and not to rely on rtnl lock. Remove rtnl lock assertions that are no longer needed. Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-07-08net: sched: implement action API that deletes action by indexVlad Buslov1-0/+39
Implement new action API function that atomically finds and deletes action from idr by index. Intended to be used by lockless actions that do not rely on rtnl lock. Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-07-08net: sched: always take reference to actionVlad Buslov1-26/+20
Without rtnl lock protection it is no longer safe to use pointer to tc action without holding reference to it. (it can be destroyed concurrently) Remove unsafe action idr lookup function. Instead of it, implement safe tcf idr check function that atomically looks up action in idr and increments its reference and bind counters. Implement both action search and check using new safe function Reference taken by idr check is temporal and should not be accounted by userspace clients (both logically and to preserver current API behavior). Subtract temporal reference when dumping action to userspace using existing tca_get_fill function arguments. Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-07-08net: sched: implement unlocked action init APIVlad Buslov1-7/+11
Add additional 'rtnl_held' argument to act API init functions. It is required to implement actions that need to release rtnl lock before loading kernel module and reacquire if afterwards. Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-07-08net: sched: change type of reference and bind countersVlad Buslov1-10/+22
Change type of action reference counter to refcount_t. Change type of action bind counter to atomic_t. This type is used to allow decrementing bind counter without testing for 0 result. Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-07-08net: sched: use rcu for action cookie updateVlad Buslov1-14/+30
Implement functions to atomically update and free action cookie using rcu mechanism. Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-22net: sched: don't disable bh when accessing action idrVlad Buslov1-10/+10
Initial net_device implementation used ingress_lock spinlock to synchronize ingress path of device. This lock was used in both process and bh context. In some code paths action map lock was obtained while holding ingress_lock. Commit e1e992e52faa ("[NET_SCHED] protect action config/dump from irqs") modified actions to always disable bh, while using action map lock, in order to prevent deadlock on ingress_lock in softirq. This lock was removed from net_device, so disabling bh, while accessing action map, is no longer necessary. Replace all action idr spinlock usage with regular calls that do not disable bh. Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-04-01Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller1-1/+3
Minor conflicts in drivers/net/ethernet/mellanox/mlx5/core/en_rep.c, we had some overlapping changes: 1) In 'net' MLX5E_PARAMS_LOG_{SQ,RQ}_SIZE --> MLX5E_REP_PARAMS_LOG_{SQ,RQ}_SIZE 2) In 'net-next' params->log_rq_size is renamed to be params->log_rq_mtu_frames. 3) In 'net-next' params->hard_mtu is added. Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-27net: Drop pernet_operations::asyncKirill Tkhai1-1/+0
Synchronous pernet_operations are not allowed anymore. All are asynchronous. So, drop the structure member. Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-27net sched actions: fix dumping which requires several messages to user spaceCraig Dillabaugh1-1/+3
Fixes a bug in the tcf_dump_walker function that can cause some actions to not be reported when dumping a large number of actions. This issue became more aggrevated when cookies feature was added. In particular this issue is manifest when large cookie values are assigned to the actions and when enough actions are created that the resulting table must be dumped in multiple batches. The number of actions returned in each batch is limited by the total number of actions and the memory buffer size. With small cookies the numeric limit is reached before the buffer size limit, which avoids the code path triggering this bug. When large cookies are used buffer fills before the numeric limit, and the erroneous code path is hit. For example after creating 32 csum actions with the cookie aaaabbbbccccdddd $ tc actions ls action csum total acts 26 action order 0: csum (tcp) action continue index 1 ref 1 bind 0 cookie aaaabbbbccccdddd ..... action order 25: csum (tcp) action continue index 26 ref 1 bind 0 cookie aaaabbbbccccdddd total acts 6 action order 0: csum (tcp) action continue index 28 ref 1 bind 0 cookie aaaabbbbccccdddd ...... action order 5: csum (tcp) action continue index 32 ref 1 bind 0 cookie aaaabbbbccccdddd Note that the action with index 27 is omitted from the report. Fixes: 4b3550ef530c ("[NET_SCHED]: Use nla_nest_start/nla_nest_end")" Signed-off-by: Craig Dillabaugh <cdillaba@mojatatu.com> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-23net/sched: remove tcf_idr_cleanup()Davide Caratti1-8/+0
tcf_idr_cleanup() is no more used, so remove it. Suggested-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: Davide Caratti <dcaratti@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-09net sched actions: calculate add/delete event message sizeRoman Mashak1-0/+43
Introduce routines to calculate size of the shared tc netlink attributes and the full message size including netlink header and tc service header. Update add/delete action logic to have the size for event messages, the size is passed to tcf_add_notify() and tcf_del_notify() where the notification message is being allocated and constructed. Signed-off-by: Roman Mashak <mrv@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-09net sched actions: update Add/Delete action API with new argumentRoman Mashak1-8/+13
Introduce a new function argument to carry total attributes size for correct allocation of skb in event messages. Signed-off-by: Roman Mashak <mrv@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-05net sched actions: corrected extack messageRoman Mashak1-1/+1
Signed-off-by: Roman Mashak <mrv@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16net: sched: act: handle extack in tcf_generic_walkerAlexander Aring1-2/+4
This patch adds extack handling for a common used TC act function "tcf_generic_walker()" to add an extack message on failures. The tcf_generic_walker() function can fail if get a invalid command different than DEL and GET. The naming "action" here is wrong, the correct naming would be command. Cc: David Ahern <dsahern@gmail.com> Signed-off-by: Alexander Aring <aring@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16net: sched: act: add extack for walk callbackAlexander Aring1-2/+2
This patch adds extack support for act walker callback api. This prepares to handle extack support inside each specific act implementation. Cc: David Ahern <dsahern@gmail.com> Signed-off-by: Alexander Aring <aring@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16net: sched: act: add extack for lookup callbackAlexander Aring1-1/+1
This patch adds extack support for act lookup callback api. This prepares to handle extack support inside each specific act implementation. Cc: David Ahern <dsahern@gmail.com> Signed-off-by: Alexander Aring <aring@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16net: sched: act: add extack to init callbackAlexander Aring1-2/+3
This patch adds extack support for act init callback api. This prepares to handle extack support inside each specific act implementation. Based on work by David Ahern <dsahern@gmail.com> Cc: David Ahern <dsahern@gmail.com> Signed-off-by: Alexander Aring <aring@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16net: sched: act: handle generic action errorsAlexander Aring1-32/+61
This patch adds extack support for generic act handling. The extack will be set deeper to each called function which is not part of netdev core api. Based on work by David Ahern <dsahern@gmail.com> Cc: David Ahern <dsahern@gmail.com> Signed-off-by: Alexander Aring <aring@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16net: sched: act: add extack to initAlexander Aring1-6/+11
This patch adds extack to tcf_action_init and tcf_action_init_1 functions. These are necessary to make individual extack handling in each act implementation. Based on work by David Ahern <dsahern@gmail.com> Cc: David Ahern <dsahern@gmail.com> Signed-off-by: Alexander Aring <aring@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16net: sched: act: fix code styleAlexander Aring1-6/+6
This patch is used by subsequent patches. It fixes code style issues caught by checkpatch. Signed-off-by: Alexander Aring <aring@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16net: Revert sched action extack support series.David S. Miller1-17/+12
It was mis-applied and the changes had rejects. Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16net: sched: act: add extack to initAlexander Aring1-6/+11
This patch adds extack to tcf_action_init and tcf_action_init_1 functions. These are necessary to make individual extack handling in each act implementation. Based on work by David Ahern <dsahern@gmail.com> Cc: David Ahern <dsahern@gmail.com> Signed-off-by: Alexander Aring <aring@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16net: sched: act: fix code styleAlexander Aring1-6/+6
This patch is used by subsequent patches. It fixes code style issues caught by checkpatch. Signed-off-by: Alexander Aring <aring@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16net: sched: fix unbalance in the error path of tca_action_flush()Davide Caratti1-1/+3
When tca_action_flush() calls the action walk() and gets an error, a successful call to nla_nest_start() is not followed by a call to nla_nest_cancel(). It's harmless, as the skb is freed in the error path - but it's worth to fix this unbalance. Signed-off-by: Davide Caratti <dcaratti@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-13net: Convert subsys_initcall() registered pernet_operations from net/schedKirill Tkhai1-0/+1
psched_net_ops only creates and destroyes /proc entry, and safe to be executed in parallel with any foreigh pernet_operations. tcf_action_net_ops initializes and destructs tcf_action_net::egdev_ht, which is not touched by foreign pernet_operations. So, make them async. Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com> Acked-by: Andrei Vagin <avagin@virtuozzo.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-06idr: Rename idr_for_each_entry_extMatthew Wilcox1-3/+3
Most places in the kernel that we need to distinguish functions by the type of their arguments, we use '_ul' as a suffix for the unsigned long variant, not '_ext'. Also add kernel-doc. Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
2018-02-06net sched actions: Convert to use idr_alloc_u32Matthew Wilcox1-35/+25
Use the new helper. Also untangle the error path, and in so doing noticed that estimator generator failure would lead to us leaking an ID. Fix that bug. Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
2018-02-06idr: Delete idr_find_ext functionMatthew Wilcox1-1/+1
Simply changing idr_remove's 'id' argument to 'unsigned long' works for all callers. Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
2018-02-06idr: Delete idr_replace_ext functionMatthew Wilcox1-1/+1
Changing idr_replace's 'id' argument to 'unsigned long' works for all callers. Callers which passed a negative ID now get -ENOENT instead of -EINVAL. No callers relied on this error value. Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
2018-02-06idr: Delete idr_remove_ext functionMatthew Wilcox1-1/+1
Simply changing idr_remove's 'id' argument to 'unsigned long' suffices for all callers. Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
2017-12-05net_sched: remove unused parameter from act cleanup opsCong Wang1-1/+1
No one actually uses it. Cc: Jiri Pirko <jiri@mellanox.com> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-11-10Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller1-2/+0
Simple cases of overlapping changes in the packet scheduler. Must easier to resolve this time. Which probably means that I screwed it up somehow. Signed-off-by: David S. Miller <davem@davemloft.net>
2017-11-09Revert "net_sched: hold netns refcnt for each action"Cong Wang1-2/+0
This reverts commit ceffcc5e254b450e6159f173e4538215cebf1b59. If we hold that refcnt, the netns can never be destroyed until all actions are destroyed by user, this breaks our netns design which we expect all actions are destroyed when we destroy the whole netns. Cc: Lucas Bates <lucasb@mojatatu.com> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: Jiri Pirko <jiri@resnulli.us> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-11-04Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller1-0/+4
Files removed in 'net-next' had their license header updated in 'net'. We take the remove from 'net-next'. Signed-off-by: David S. Miller <davem@davemloft.net>
2017-11-03net_sched: hold netns refcnt for each actionCong Wang1-0/+2
TC actions have been destroyed asynchronously for a long time, previously in a RCU callback and now in a workqueue. If we don't hold a refcnt for its netns, we could use the per netns data structure, struct tcf_idrinfo, after it has been freed by netns workqueue. Hold refcnt to ensure netns destroy happens after all actions are gone. Fixes: ddf97ccdd7cb ("net_sched: add network namespace support for tc actions") Reported-by: Lucas Bates <lucasb@mojatatu.com> Tested-by: Lucas Bates <lucasb@mojatatu.com> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: Jiri Pirko <jiri@resnulli.us> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-11-03net_sched: acquire RTNL in tc_action_net_exit()Cong Wang1-0/+2
I forgot to acquire RTNL in tc_action_net_exit() which leads that action ops->cleanup() is not always called with RTNL. This usually is not a big deal because this function is called after all netns refcnt are gone, but given RTNL protects more than just actions, add it for safety and consistency. Also add an assertion to catch other potential bugs. Fixes: ddf97ccdd7cb ("net_sched: add network namespace support for tc actions") Reported-by: Lucas Bates <lucasb@mojatatu.com> Tested-by: Lucas Bates <lucasb@mojatatu.com> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: Jiri Pirko <jiri@resnulli.us> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-20net/sched: Set the net-device for egress device instanceOr Gerlitz1-0/+1
Currently the netdevice field is not set and the egdev instance is not functional, fix that. Fixes: 3f55bdda8df ('net: sched: introduce per-egress action device callbacks') Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com> Acked-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-11net: sched: introduce per-egress action device callbacksJiri Pirko1-0/+220
Introduce infrastructure that allows drivers to register callbacks that are called whenever tc would offload inserted rule and specified device acts as tc action egress device. Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-09-13net: sched: fix use-after-free in tcf_action_destroy and tcf_del_walkerJiri Pirko1-2/+4
Recent commit d7fb60b9cafb ("net_sched: get rid of tcfa_rcu") removed freeing in call_rcu, which changed already existing hard-to-hit race condition into 100% hit: [ 598.599825] BUG: unable to handle kernel NULL pointer dereference at 0000000000000030 [ 598.607782] IP: tcf_action_destroy+0xc0/0x140 Or: [ 40.858924] BUG: unable to handle kernel NULL pointer dereference at 0000000000000030 [ 40.862840] IP: tcf_generic_walker+0x534/0x820 Fix this by storing the ops and use them directly for module_put call. Fixes: a85a970af265 ("net_sched: move tc_action into tcf_common") Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-09-12net_sched: get rid of tcfa_rcuCong Wang1-9/+8
gen estimator has been rewritten in commit 1c0d32fde5bd ("net_sched: gen_estimator: complete rewrite of rate estimators"), the caller is no longer needed to wait for a grace period. So this patch gets rid of it. This also completely closes a race condition between action free path and filter chain add/remove path for the following patch. Because otherwise the nested RCU callback can't be caught by rcu_barrier(). Please see also the comments in code. Cc: Jiri Pirko <jiri@mellanox.com> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: Eric Dumazet <edumazet@google.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-09-05net: sched: don't use GFP_KERNEL under spin lockJakub Kicinski1-2/+6
The new TC IDR code uses GFP_KERNEL under spin lock. Which leads to: [ 582.621091] BUG: sleeping function called from invalid context at ../mm/slab.h:416 [ 582.629721] in_atomic(): 1, irqs_disabled(): 0, pid: 3379, name: tc [ 582.636939] 2 locks held by tc/3379: [ 582.641049] #0: (rtnl_mutex){+.+.+.}, at: [<ffffffff910354ce>] rtnetlink_rcv_msg+0x92e/0x1400 [ 582.650958] #1: (&(&tn->idrinfo->lock)->rlock){+.-.+.}, at: [<ffffffff9110a5e0>] tcf_idr_create+0x2f0/0x8e0 [ 582.662217] Preemption disabled at: [ 582.662222] [<ffffffff9110a5e0>] tcf_idr_create+0x2f0/0x8e0 [ 582.672592] CPU: 9 PID: 3379 Comm: tc Tainted: G W 4.13.0-rc7-debug-00648-g43503a79b9f0 #287 [ 582.683432] Hardware name: Dell Inc. PowerEdge R730/072T6D, BIOS 2.3.4 11/08/2016 [ 582.691937] Call Trace: ... [ 582.742460] kmem_cache_alloc+0x286/0x540 [ 582.747055] radix_tree_node_alloc.constprop.6+0x4a/0x450 [ 582.753209] idr_get_free_cmn+0x627/0xf80 ... [ 582.815525] idr_alloc_cmn+0x1a8/0x270 ... [ 582.833804] tcf_idr_create+0x31b/0x8e0 ... Try to preallocate the memory with idr_prealloc(GFP_KERNEL) (as suggested by Eric Dumazet), and change the allocation flags under spin lock. Fixes: 65a206c01e8e ("net/sched: Change act_api and act_xxx modules to use IDR") Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: Simon Horman <simon.horman@netronome.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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